Things to Do, Travel Tips, & Advice

A train derailment at Chicago's O'Hare International Airport injures 32 people, the search continues for Malaysian Airlines flight MH370 and a New York Times report on TSA's misplaced faith in reading body language are among today's points of interest.

Pi Day: March 14, also 3/14, marks the day the world celebrates pi, the mathematical constant that defines the ratio of a circle's circumference to its diameter. The number hovers around 3.14 (hence the date chosen to honor it), but its decimal places go on infinitely. Mathematicians have been chasing after π 's exact value for thousands of years, to no avail.

Obviously, something so mysterious must be heralded. Here are four ways people are celebrating the holiday around the United States.

Eat all you can aboard the Spirit of Chicago sightseeing yacht as it glides across Lake Michigan. Photo: Spirit of Chicago.

Spring fever rages in Chicago where the perennially pent-up-by-winter shed a dozen pounds -- literally and psychically -- just by shrugging off their Gore-Tex and shedding Sorels.

Get the All-Inclusive Treatment: Spirit of ChicagoPay one price for a bundled food or drink experience

Combine a sightseeing tour with an all-you-can-eat meal aboard Spirit of Chicago. The Navy Pier-based, 600-capacity yacht makes dining tours several times weekly. Gorge on salads and chicken at lunch (from $49.90) and sirloin and talapia at dinner (from $72.90) between selfies and panoramas of the skyline.